/*
 * Copyright (C) 2009 Leandro de Oliveira Aparecido <lehphyro@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.code.configprocessor;

import org.codehaus.plexus.component.configurator.expression.*;

public class ExpressionResolver {

	private ExpressionEvaluator evaluator;
	
	public ExpressionResolver(ExpressionEvaluator evaluator) {
		this.evaluator = evaluator;
	}
	
	public String resolve(String value) {
		try {
			Object resolvedValue = evaluator.evaluate(value);
			if (resolvedValue != null && !(resolvedValue instanceof String)) {
				throw new IllegalArgumentException("Expression [" + value + "] did not resolve to String");
			}
			return (String)resolvedValue;
		} catch (ExpressionEvaluationException e) {
			throw new RuntimeException("Error resolving expression [" + value + "]", e);
		}
	}
	
}
